Antitumor protein hybrid, composed of a moiety which is substantially the fragment Fab of an antitumor immunoglobulin and a moiety which is substantially the fragment A of a diphtheria toxin, which is expressed by the following formula (1):
(where Fab indicates a moiety which is substantially the fragment Fab of an antitumor immunoglobulin; FA indicates a moiety which is substantially the fragment A of a diphtheria toxin; X indicates a divalent organic radical; S, and S2 are both sulfur atoms, S, indicating a sulfur atom arising from the disulfide bond (-S-S- bond) in an immunoglobulin and S2 a sulfur atom arising from the disulfide bond in a diphtheria toxin; n stands for 0 or 1 and m stands for an integer of 1 to 5). This antitumor protein hybrid has remarkable and specific citotoxicity against tumor cells.
抗肿瘤蛋白杂交种,由基本上是抗肿瘤免疫球蛋白的片段 FAb 的分子和基本上是白喉毒素的片段 A 的分子组成,其表达式如下(1):
(其中 FAb 表示基本上是抗肿瘤免疫球蛋白 FAb 片段的分子;FA 表示基本上是白喉毒素 A 片段的分子;X 表示二价有机基;S和S2都是
硫原子,S表示免疫球蛋白中二
硫键(-S-S-键)产生的
硫原子,S2表示白喉毒素中二
硫键产生的
硫原子;n表示0或1,m表示1至5的整数)。这种抗肿瘤蛋白混合物对肿瘤细胞具有显著的特异性柠檬毒性。